Find ∠B and ∠C, if A is the centre of the circle. Class 7

Find ∠B and ∠C, if A is the centre of the circle. Class 7

Question 1.

Find ∠B and ∠C, if A is the centre of the circle. Class 7

Solution:

AB = AC

So, ∠B = ∠C

= [latex]\frac{180^{\circ}-120^{\circ}}{2}[/latex] = 30° 

Question 2.

Find the missing angles. As per the convention that we have been following, all line segments marked with a single ‘ | ’ are equal to each other and those marked with a double ‘ | ’ are equal to each other, etc. Class 7

Solution:

Angles have been written in the figure itself. It is based on properties of isosceles and equilateral triangles and also sum of the angles of a triangle as 180°.